Then there was a sudden shortage, caused by changes in water temperature and currents and other environmental conditions.
And there's no guarantee of a successful hunt: in 2008, possibly because of changes in water temperature, ocean currents and the distribution of prey, no whales were caught at all.
The giant otter's highly sensitive whiskers (vibrissae) allow the animal to track changes in water pressure and currents, which aids in detecting prey.
Both will measure processes such as upwelling (important for the recycling of nutrients that have fallen to the seabed), oxygen depletion (which is often caused by pollution), and the dramatic changes in water temperature, salinity and currents that happen where the continental shelf dives into the abyss.The remaining four observatories are stationed in deeper water.
Temporal and spatial variations in the beach and shoreline environment are produced by a combination of highly complex interactions between the influences of anthropogenic activities, and the initial morphodynamic state of the beach governed by natural processes, among them changes in water levels, tides, waves, currents, winds, and sediment supply.
These flows qua differential elements enter into relations of reciprocal determination linking changes in any one element to changes in the others; thus temperature and pressure differences will link changes in air and water currents to each other: updrafts are related to downdrafts even if the exact relations (the tightness of the links, the velocity of the flows) are not yet determined.
The deep-water successions contain regional, locally diachronous, submarine unconformities that were generated in response to changes in deep-water current circulation and slope processes, rather than subaerial erosion.
Some 300 researchers from more than a dozen institutions will spend the next decade documenting everything from changes in water quality, pollution, and the strength of currents to shifts in biodiversity and the population genetics of marine life.
The kinds of plants that are going to grow or aren't going to grow, the Amazon, changes in air currents around the Earth, changes in water.
The approach defines current pressures on water resources and evaluates future changes in water allocation in the medium term under climatic and water use scenarios, considering changes in population and in irrigated areas.
